Car-door-control device



Apr. 1o, 1923.

c. FARMER CAR DOOR CONTROL DEVICE Filed MaIV 24, 1922 il A INVENTOR v CLYDE C-FARMER IOS U 02(1...2 m

Patented Apr. 10, 1923.

CLYDE C. FARMER, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOB TO THE WESTING- HOUSE AIR BRAKE COMPANY, OF WILIVIERDING, PENNSYLVANIA, A CORPORATION- OF PENNSYLVANIA.

PATENT ori-"ica can-noon-con'rnor. DEVICE.

Application iled March 24, 1922. Serial No. 546,524.

To all whom t may concern: c

Be it known that I, CLYDE C. FARMER, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Car-Door-Control Devices, of which the following is a specication.

This invention relates to car" door controlling devices, and more particularly to means for controlling a plurality of car doors. e

Particularly on cars lemployed in electric traction service, a plurality of car doors are provided, such as an exit and an entrance door, and under varying conditions of service, there are times when it is desirable that only one of the doors shall be opened and other times when both doors may be opened. The principal object of lmy invention is lto provide means forselectively. operating the car doors, so that at one time both doors maybe operated simultaneously and atanother time either one of the doors may be opened while the other door remains closed.

` Other objects and advantages will appear i in the following more 4detailed description 'of the invention.

In the accompanying drawing; Figpl is a sectional view vof a combined brake valve and door selector device embodying my invention, showing the brake valverin release position and the door selector in the position for operating both doors; Figs; 2, 3, and 4,

85 sectional views of the combined brake valve and door selector device, showing the door selectorin the position for controlling both doors and the brake valve in the respective positions oflap with doors closed, service 40 application with 4doorsclosed, andbrakes applied with the doors open; Fig. 5 a similar view, showing the brake valve in emer-y gency application position; Fig. 6a similar view, showing the door selector in the position for operating the entrance door and the brake valve in brake applied position; and Fig. 7 a similar view, showing the door selector in the position for operating the enf trance door, with the brake valve in thek brake applied position. i

As shown in the drawing, the fluid presvin valve chamber 6,

vsage 8,. connected to the usual straight air pipe, exhaust passage 9, passage 10, connectv ed to the usualv emergency brake pipe, and passages 11 and 12, which lead to the seat of rotary valve 5. .Leading to the seat of rotary valve 5y is passage 13, connected to the exit l door opening pipe, passage 14, connected to the entrance door openingpipe, exhaust passage 15, passage 16,V connected to the entrance door closing pipe, and passage 17, connected to the exit door closing pipe.

The door selector valve 5 has three ,positions, one in which connections are'made for controlling both doors simultaneously, another in which only theeXit door is operated, and avthird in which only fthe entrance doory is operated.

In'operation, if it is desired to operate both doors simultaneously, the valve 5 is turned to the position shownin Fig. 1, in which a. cavity 18 connectsthe door closing passages 16 and'17k with passage y12 and a "cavity 19 connectsv the door opening passages 13 and 14 with passage 11.

' Itv lwill be understood that a door engine is provided for controlling the entrance door and a door engine foi-controlling the eXit door andthat each door engine-may be of the usual construction having connected pistons, the admission otiuid'pressure to one pistonlbeing adapted to eifect the opening of the car door and the admission of iuidpres-,

sure tothe other close the car door. l, l

In the release position of the brake'valve,

the straight air pipe 8 is connected by cavity y 20 with exhaust port 9', so thatthe brakes are released and passage yllfis. connectedby cavity v21` with exhaustfpassage 9, so7 ythat both of the'doorrv opening passages'land f 14 are connectedto the atmosphere. Passage l12 is connected by cavity 22 ywith the piston being adaptedfto emergency brake pipe passage 10, so that fluid fromthe emergency brake pipe is supplied through passages 16 and 17 to the door vclosingpistons of both the entrance and the exit door controlling engines, thus causing the door engines to operate to close both I doors.

` sage 11 and cavity 26 passage 10 with passage 12, so that fluid.

under pressure is supplied to the door closing pistons of the door engines,'\vhile the door opening pistons are' connected tothe exhaust. The car doors are thus held closed, as in release position. l

If it 'is desired to apply the brakes and open the car doors, the brake valve is turned i -to the position shown in Fig.y il, in which port 23 registers with straight air passage 8 so that fluidunder pressure is supplied toveffect an application of the brakes.' Ay port 27 registers With passage 11, so that fluid under pressure is supplied through the door selector valve 5 to the door'opening pistons of the door engines Whilepassage 12 is-connected through cavity 28 with exhaust passage 9 so that the door closing pistons of thedoor engines are connected to the atmosphere. The car doors Willtherefore be opened when the brakes are appliedinthis position. y

If only the entrance door is to be koperated, the door selector valve 5 is turned to the position shovvn in Fig. 6, in which the exit door .closing passage ,'17 is connectedk through cavity 29 with passage r30 leading to the emergency brake .pipe passage '10,y

While the exit kdoor opening passage 13 is connected through cavity 31 with passage 15, leading .to lthe atmosl'iherc. Since fluid pressure is thus supplied to the door clos.- ing kpiston of the exit door engine. While the door opening piston is openl to the at mosphere, the exit door Will be held in the closed position,so long as the door selector valve remains in this position, and regardless of the movement of the brake valve.

l If .the brake valve is moved to brake application. position in whichthe entrancey car door is to be opened, the brake valve connectionswill he thesame as shown in Fig. 4, in `Which fluidunder pressure is supplied through port 23 to passage 8. In this position of the doory selector valve, passage 11 is connected through cavity 33 with the entrance door open passage 111 While the entrance door closing passage 16 is connected through cavity 34C with passage 12 which is connected through cavity 28 in the valve 3 with exhaust passage 9. Fluid under pressure is thus supplied to the door opening piston of the entrance door engine to effect the opening of the entrance door. Nhen the brake valve yis turned to release position, the passage 11' is connected 'to the exhaust passage 9 While passage 12 is connected to the brake pipe passage 10, so that the door closing piston of the entrance door engine is supplied with fluid under pressure While the door opening piston is connected to the atmosphere and consequently thc entrance door is moved to closed position.

, 'if it is desired to operate only the exit door, the door selector valve 5 is turned to the'position shown in Fig. 7, in which the entrancedoor opening passage 14- is connected through cavity 35 with exhaust passage lvivhile the entrance door closing passage 16 is connected through cavity 36 with `passage 30 leading to the brake pipe pas sage 10.` Fluid under pressure vvill thus be supplied to the door closing piston of the entrance door engine While the door opening piston is connected to the atmosphere. and therefore the entrance door will be held closed so long as the d oor selector valve remains iny this position, regardless of the vmovement of the brake valve.

1i itis desired to apply the brakes and open the exist door, the brake valve is turned to the position shown in Fig. 7 which is the same kas the position shown in Fig. f-L and fluid `under pressure is supplied to passage 11 and thence through cavity 37 to the exit door opening passage 13, While passage 12 is connected Lto the atmosphere, so that since the exit door closing passage 17 is connected i through cavity 3S with passage 12, the door closing piston of the exit door engine will be subject to atmospheric pressure and the exit car door Will be opened. c

Then the brake valve is turned to release position, the passage 11 is connected to the exhaust, While passage 12 isconnected to the emergency brake pipe, so that fluid `under pressure is supplied to the door closing piston of the exit door engine to effect the closing of the exit door. It will `be noted that fluid under pressure for operating the car door engines is supplied from the emergency brake pipe and sincein an emergency application of the brakes. `the emergency brake pipe is vented tovtheatof the car door engines, which may be suhje'ct to fluid pressure at the timethe emer ,i mosphere, it will be clear that all pistons A tons of each'door engine are subject to atmospheric pressure, the fluid pressures will be balanced and the car doors mayy readily device for controlling a plurality of 'car doors and a door selector device for determining Which car door shall be operated by A the movement of the manually operatedl device.

2. The combination witha brake valve dev vice having ports for controlling aplurality of car doors, of a selector valve device for controlling communication through which the car doors 'are'- controlled by said brake valve. device.

3. The combination With a brake valve device having ports for` controllin the fluid pressure for operating a plura 1ty of car 1 doors, of a selector valve device having a position in which communication is opened through which one car door is controlled by the brake valve devicek and communication is closed through which another car door is controlled.

4. The combination with a brake valve device having ports for controlling the fluid pressure for operating a plurality of car doors, of a selector valve device having a position in which communication is opened through which one car door is controlledby the brake valve device and communication is closed through which another carI door is controlled, and another -positionin` which car doors.

5. The combination with a brake valve del vice having ports for controlling the fluid pressure for operating a plurality of car doors, of a selector valve device having a position for controlling the uid pressure for holding one car door closed and for opening communication through whichy another car door is controlled by said brake valve device. l

Y 6. The combination with a brake valve device having ports for controlling the Huid pressure for'operating a plurality of car doors, of a selector valvedevice. having a v position for establishing communication through which two car doors are controlled by said brake valve device and other positions in which one car door is held closed while communication is opened through Whicha-nother car door is controlled by manipulation of the brake valve device. j

7. The combination with a brake valve device having ports for supplying iluid under pressure for opening and closing two car doors, of a selector valve device having a position in which communication is opened for controlling both doors by manipulation of the brake valve device, and other positions in which the selector valve device supplies fluid under pressure for holding one car door closed while establishing 'communicaf tion through which the other door is controlledvby Said brake valve device.

In testimony whereof I have hereunto set my hand. v

CLYDE C. *l 

